Fuel and reductant delivery system

ABSTRACT

A system and a method for providing fuel and reductant to a vehicle from a fuel dispensing station are disclosed which allow for providing both fluids to a vehicle equipped with a fuel and reductant tank and allows for providing only fuel to a vehicle without a reductant tank.

BACKGROUND OF INVENTION

[0001] The present invention relates to a system for intelligentlysupplying fuel to a vehicle, or when a vehicle is capable, both fuel andreductant.

[0002] Vehicles using diesel engines can be coupled with a lean NOxcatalyst to reduce nitrogen oxide (NOx) emitted from the diesel engine.Lean NOx catalyst typically process NOx in the presence of a reducingagent, such as hydrocarbons, urea, aqueous ammonia, etc. If thereductant is other than diesel fuel, it can be provided from a separatetank, or reservoir, onboard the vehicle.

[0003] One known method of re-fueling the vehicle and replenishing aseparate reductant reservoir uses a fuel pump (nozzle) that suppliesboth the reductant and the diesel fuel to the vehicle. However, theinventor herein has recognized a disadvantage with such an approach.

[0004] In particular, such a pump cannot be used with diesel poweredvehicles that do not have a separate reductant storage/delivery system.This results in duplicitous facilities and hardware in the fuel fillingstation, as well as conscious efforts by vehicle operators to ensurethat the proper pump is used depending on the vehicle configuration.

[0005] Another known method is described in U.S. Pat. No. 6,032,703. Inthis system, a reductant is supplied when requested by the vehiclecontroller. However, the inventor herein has recognized that such anapproach requires additional electronic hardware, which results in addedcost and complexity. Further, such a system is only compatible withvehicles having the special electronics.

SUMMARY OF INVENTION

[0006] The disadvantages of prior approaches are overcome by a systemfor fueling a vehicle with means for delivering a first stream of fueland a second, separate, stream of reductant to the vehicle when thevehicle is equipped with a fuel tank capable of receiving the firststream of fuel and a reductant tank capable of receiving the secondstream of reductant. The system delivers only the first stream of fuelto the vehicle when the vehicle is not equipped with the reductant tank.The system may also contain an operator trigger coupled to thedelivering means.

[0007] By providing only fuel for vehicles that cannot accept reductant,and both fuel and reductant for vehicles that can accept reductant, itis possible to have a single fueling system that is equally compatible.Further, this prevents operators from accidentally supplying reductantto non-reductant vehicles, as well as guaranteeing that reductantcapable vehicle receive reductant when re-fuelled. Thus, an advantage ofthe present invention is a simple, ergonomic system that is compatiblewith various vehicles. In addition, this allows for reduced capitalinvestment in developing fuel and reductant supply systems. Furtherstill, a single operating filling action can supply both neededreductant and fuel. Finally, the present invention can be implementedwithout additional electronic hardware, thereby providing a costeffective solution.

BRIEF DESCRIPTION OF DRAWINGS

[0008]FIG. 1 is a sketch of primary and secondary fluid tanks and afiller neck through which the primary and secondary fluids are suppliedto the tanks, according to an aspect of the present invention;

[0009]FIG. 2 is a sketch of a dispensing nozzle which is shutoff,according to an aspect of the present invention;

[0010]FIG. 3 is a sketch of a dispensing nozzle through which fluid isbeing dispensed, according to an aspect of the present invention;

[0011]FIG. 4 is a sketch of a vehicle at a dispensing station, accordingto an aspect of the present invention;

[0012]FIG. 5a is a sketch of a dispensing nozzle uncoupled to a fillerneck;

[0013]FIG. 5b is a sketch of a dispensing nozzle partially coupled to afiller neck, without dispensing primary or secondary fluids, accordingto an aspect of the present invention;

[0014]FIG. 5c is a sketch of a dispensing nozzle coupled to a fillerneck, allowing dispensing primary and secondary fluids, according to anaspect of the present invention;

[0015]FIG. 6 is a cross-sectional of a filler neck, according to anaspect of the present invention;

[0016]FIG. 7 is a sketch of an alternative embodiment of a dispensingnozzle and a filler neck, according to an aspect of the presentinvention;

[0017]FIG. 8 is a cross-section of the dispensing nozzle of FIG. 7,according to an aspect of the present invention;

[0018]FIG. 9 is a cross-section of the filler neck of FIG. 7, accordingto an aspect of the present invention;

[0019]FIG. 10 is a sketch of a dispensing nozzle and a filler neck,according to an aspect of the present invention;

[0020]FIG. 11 is a cross-section of the filler neck of FIG. 10,according to an aspect of the present invention; and

[0021]FIG. 12 is a sketch of a dispensing nozzle and a filler neck,according to an aspect of the present invention.

DETAILED DESCRIPTION

[0022] In FIG. 1, a primary fluid tank 12, which holds a primary fluid,and a secondary fluid tank 22, which holds a secondary fluid, areconnected to filler neck 42 by primary filling passageway 16 andsecondary filling passageway 26, respectively. Filler neck 42 isconnected to the vehicle (not shown in FIG. 1) and provides the openingfor dispensing fluids to the vehicle. Cap 38 fits onto filler neck 42.

[0023] Discriminator insert 44, which is attached to filler neck 42, mayprovide at least two functions. Discriminator insert 44 houses secondaryfluid passageway 26, which conducts secondary fluid down filler neck 42through check valve 32 and into secondary fluid tank 22. Check valve 32opens under secondary fluid supply pressure. Alternatively, valve 32could be a manually actuated valve. Also, discriminator insert 44prevents the insertion of nozzles with inside diameter less than thediameter of discriminator insert 44 to ensure that only the propernozzles are allowed to mate with the vehicle.

[0024] Combination vent valves 14 and 24 located in the primary andsecondary fluid tanks, respectively, provide the following functions:shutoff of fuel dispensing provided by a float valve, pressure reliefprovided by a pressure relief valve set at a minimal pressure for theprimary fluid tank, but at a pressure higher than supply pressure forthe secondary fluid tank, vacuum relief provided by a vacuum valve whichpermits the entry of air as the fluid is consumed during normal vehicleoperation, and spill prevention provided by a gravity valve.

[0025] Referring to FIG. 2, dispensing nozzle 50 contains a secondaryfluid dispensing passageway 54 which is supplied secondary fluid via asecondary fluid supply 86. A secondary fluid delivery valve 60 islocated close to the opening of secondary fluid dispensing passageway 54to prevent inadvertent release of the secondary fluid and to preventinadvertent contamination of primary fluid with secondary fluid and viceversa. Dispensing nozzle 50 also contains primary fluid passageway 52. Aprimary fluid dispensing valve controlling the flow of the primary fluidthrough dispensing nozzle 50 is located upstream of dispensing nozzle50. Vacuum shutoff passageway 58 connects between a vacuum sourcesituated upstream of dispensing nozzle 50 (vacuum source not shown) anda vacuum shutoff sensor orifice 56. Flow of primary fluid throughdispensing nozzle 50 continues until vacuum shutoff sensor orifice 56 iscovered by fluid, that is, the tank is substantially full. At thatpoint, a vacuum is developed within the vacuum shutoff passageway 58causing the primary fluid dispensing valve (not shown) to shut off,thereby preventing further dispensing of the primary liquid.

[0026] The downstream section of dispensing nozzle 50 is radiallysymmetric, except for vacuum shutoff passageway 58, as shown in FIGS. 2and 3. To dispense primary fluid, nozzle 50 is coupled to filler neck42, a cross-section of which is shown in FIG. 6. Filler neck 42 containsa discriminator insert 44. Discriminator insert 44 may comprise multiplefins on the exterior surface of secondary fluid filling passageway 26.Vacuum passageway blocker sector 92, forms a partial ring arounddiscriminator insert 44 except that a portion of the ring is removed;90° of the circumference of a ring is missing in the present example.The portion of the ring that is removed provides space for vacuumshutoff passageway 58 of dispensing nozzle 50 when the two are coupled.Dispensing nozzle 50 is inserted into filler neck 42 with the centerlineaxes of both coincident with a range of radial orientations; a range ofapproximately +/−40°, in the present example. That is, vacuum shutoffpassageway 58 mates with the removed sector of vacuum passageway blockersector 92. Otherwise, vacuum shutoff passageway 58 would collide withvacuum passageway blocker sector 92 preventing coupling of dispensingnozzle 50 with filler neck 42.

[0027] The significance of the indexing function of vacuum passagewayblocker 92 will become apparent in the following discussion; theinventor of the present invention has envisioned an additional use forthe vacuum shutoff apparatus, which will become apparent in regards toFIGS. 5a-c in which engagement of dispensing nozzle 50 and filler neck42 is considered. When dispensing nozzle 50 mates with filler neck 42,the asymmetric features on each, the vacuum shutoff passageway 58 andthe vacuum passageway blocker 92, respectively, allow insertion in onlya range of orientations. Filler neck 42 has an inhibitor pad 46 coveringa sector of the interior surface of filler neck 42, shown incross-section FIG. 6 as 90°. During insertion of dispensing nozzle 50into filler neck 42, vacuum shutoff sensor orifice 56 is covered byinhibitor pad 46, thereby causing a vacuum to be developed in vacuumshutoff passageway 58 preventing the primary fluid from being dispensed.The length of inhibitor pad 46 is such that when dispensing nozzle 50 isfully inserted into filler neck 52, vacuum shutoff sensor orifice isbeyond inhibitor pad 46, thus allowing primary fluid to be dispensed.The term fully inserted herein means that dispensing nozzle 50 isinserted such that secondary fluid dispensing passageway 54 andsecondary fluid filling passageway 26 are coupled to allow dispensing ofsecondary fluid.

[0028] Referring now to FIGS. 5a-c, in FIG. 5a, dispensing nozzle 50 andfiller neck 42 are not coupled and neither fluid is flowing. The primaryfluid is prevented from flowing due to vacuum shutoff sensor orifice 56being covered by inhibitor pad 46. The secondary fluid is prevented fromflowing due to secondary fluid delivery valve 60 being in its normallyclosed position. In FIG. 5b, dispensing nozzle 50 and filler neck 52 arepartially coupled. Again, primary fluid is prevented from beingdispensed by vacuum shutoff sensor orifice 56 being covered by inhibitorpad 46. Fluid separation seal 64 mates with the secondary fluid fillingpassageway 26. However, secondary fluid delivery valve 60 remainsclosed. In FIG. 5c, both fluid passageways are coupled and both fluidsmay be dispensed. The primary fluid is allowed to flow because vacuumshutoff sensor orifice 56 is inserted beyond inhibitor pad 46. Secondaryfluid is allowed to flow because secondary fluid delivery valve 60 hasbeen mechanically opened by delivery valve opening pin 62; specifically,fluid separation seal 64 prevented further movement of the tip of thesecondary fluid delivery valve 60 beyond that illustrated in FIG. 5b.Consequently, the internal spring of secondary fluid delivery valve 60is compressed and delivery valve opening pin 62 forces the opening ofthe valve by pushing the valve's ball from its seat. Fluid separationseal 64 prevents intermixing of the two fluids during dispensing.

[0029] An alternative embodiment of dispensing nozzle 50 and filler neck42 is shown in FIG. 7. In this embodiment, primary fluid is preventedfrom being dispensed until secondary fluid is concurrently dispensed,with a difference from the embodiment described above being thatdispensing nozzle 50 may be coupled to filler neck 42 in any angularposition, i.e., no indexing. In FIG. 7, a secondary fluid supply 86 andreturn 88 are provided to secondary fluid dispensing passageway 54.Delivery valve opening pin 62 is shown installed in filler neck 42. Across-section of dispensing nozzle 50 is shown in FIG. 8 showingsecondary fluid supply 86, secondary fluid return 88, vacuum shutoffpassageway 58, and primary fluid dispensing passageway 52. Filler neck42 contains an inhibitor ring 94 on the internal surface. Inhibitor ring94 substantially prevents primary fluid to be dispensed unlessdispensing nozzle is inserted sufficiently into filler neck 42 so thatvacuum shutoff sensor orifice 56 is inserted beyond inhibitor ring 94.When dispensing nozzle 50 is inserted sufficiently to allow primaryfluid to be dispensed, delivery valve opening pin 62 opens secondaryfluid delivery valve 32 causing the secondary fluid to be dispensedimmediately. A cross-section of filler neck 42 is shown in FIG. 9indicating blocker ring 94 extends around the circumference of thefiller neck 42. FIG. 9 shows three fins for discriminator insert 44, byway of example. Any plurality of fins for discriminator insert 44 may beused. Discriminator insert 44 provides support for secondary fluidpassageway, as shown in FIG. 7. Primary fluid filling passageway 16comprises the space inside inhibitor ring 94 which is external tosecondary fluid filling passageway 26 excluding space occupied bydiscriminator insert 44.

[0030] If the present invention is used on a diesel vehicle, in whichprimary fluid tank 12 contains diesel fuel, and secondary fluid tank 22contains reductant, it is desirable that the operator be disallowed fromfilling primary tank 12 without also filling secondary tank 22. Thelocation of pad 46 is such that during the procedure of insertingdispensing nozzle 50 into filler neck 42, secondary fluid delivery valve60 and check valve 32 are opened causing secondary fluid to flow priorto vacuum shutoff sensor orifice 56 being uncovered by inhibitor pad 46.This ensures that primary fluid tank 12 may not be supplied fuel withoutsecondary fluid tank 22 being supplied reductant. The clearances betweendispensing nozzle 50 and inhibitor pad 46 as well as inhibitor padmaterial are selected to ensure that when vacuum shutoff sensor orifice56 is in the proximity of inhibitor pad 46, that inhibitor pad 46 coversvacuum shutoff sensor orifice 46 sufficiently such that a vacuum isdeveloped in vacuum shutoff passageway 58 to restrict the flow ofprimary fluid.

[0031] It is desirable that dispensing nozzle 50 be able to dispense aprimary fluid to a prior generation vehicle, that is, one which does notuse a secondary fluid. Because the filler neck of a prior generationvehicle does not contain inhibitor pad 46 or inhibitor ring 94, vacuumshutoff sensor orifice 56 is not covered and the vacuum shutoff does notprevent dispensing the primary fluid. Furthermore, the filler neck of aprior generation vehicle does not contain a secondary fluid fillingpassageway 26 which would actuate the secondary fluid delivery valve 60.Thus, the present invention provides for dispensing only primary fluidto prior generation vehicles, that is, those without secondary fluidtanks 22.

[0032] Both embodiments described above provide for disallowingdispensing a primary fluid, which may be diesel fuel, to a vehicle whichis equipped with a secondary fluid tank, the secondary fluid tank maystore reductant. Primary fluid is prevented from being dispensed byoccluding vacuum shutoff sensor orifice 56. Prior generation vehicles,which do not contain a secondary fluid tank, are able to be fuelled withthe system of the present invention as it would not contain an inhibitorpad 46 or inhibitor ring 96 in its filler neck 42. Thus, the presentinvention allows for both types of vehicles to be dispensed appropriatefluids to replenish their tanks. Furthermore, intervention on the partof the operator to provide the distinction is avoided. An additionaladvantage of the above described embodiments is that addition ofsecondary fluid is provided for without operator intervention andsecondary fluid tank replenishment is accomplished during primary fluiddispensing intervals.

[0033] In prior art diesel fuel dispensing systems, petrol(alternatively called gasoline) may be added to diesel fuel tanks withserious potential for negative consequences: potential ruin of the fuelinjection hardware and the engine. The present invention, which includesinhibitor insert 44, prevents such unintended misfueling when theoutside diameter of inhibitor insert 44 is purposely greater than aninside diameter of the petrol dispensing nozzle. Because the operator isprevented from inserting the gasoline nozzle into filler neck 42 andwould, thus, suspect a problem by the inability of a gasoline nozzle tobe inserted into filler neck 42. Referring to FIG. 10, an alternativefluid dispensing nozzle 96 is shown. Because the inside diameter ofalternative fluid dispensing nozzle 96 is smaller than the outsidediameter of discriminator insert 44, alternative fluid dispensing nozzle96 cannot be inserted into filler neck 42. The cross-section of fillerneck 42 is shown in FIG. 1 1, showing discriminator insert 44 as afour-pointed star. Discriminator insert 44 may have a minimum of twopoints to perform the desired function. Referring to FIG. 12, the insidediameter of dispensing nozzle 50 is large enough to mate withdiscriminator 44. Consequently, a vehicle equipped with discriminatorinsert 44 permits insertion of dispensing nozzles 50 of appropriatediameter only. FIGS. 11 and 12 indication a general application of adiscriminator insert, regardless of whether the dispensing system is forsingle or multiple fluid.

[0034] It is desirable that the operator of a vehicle equipped with bothprimary fluid tank 12 and secondary fluid tank 22 uses a fuel dispensingstation which provides for both tanks to be replenished. To prevent theoperator from using a dispenser of primary fluid which does not alsohave the facility for filling of the secondary fluid, the outsidediameter of inhibitor insert 44 is greater than the inside diameter ofdiesel-only dispensing nozzles. In this way, the operator may beprevented from dispensing a primary fluid without, at the same time,filling secondary fluid tank 22.

[0035] In summary, discriminator insert 44 may be used to prevent petrolbeing dispensed into a diesel-equipped vehicle. Another advantage, whichmay be provided by discriminator insert 44, is that vehicles equippedwith reductant tanks may be prevented from fueling at diesel-only fueldispensing stations.

[0036] Filler neck 42 and dispensing nozzle 50 may be fabricated ofelectrically conductive materials. Specifically, vacuum shutoffpassageway 58 of dispensing nozzle 50 and inhibitor pad 46 (or inhibitorring 94 in the alternative embodiment), i.e., elements such as theseexamples, which are in contact when dispensing occurs, may be made ofelectrically conductive materials.

[0037] Secondary fluid tank 22 may contain an aqueous solution ofammonia or urea, which freezes at 12° C. and is predominantly comprisedof water and, thus, expands upon freezing. Although the shape ofsecondary fluid tank 22 in FIG. 1 is of a conventional shape, secondaryfluid tank 22 may be that of a frustum of a cone with the largerdiameter cross-section elevated higher than the smaller diametercross-section. Tanks with cross-sectional area increasing monotonicallyfrom the bottom of the tank to the top of the tank allow expansion spacefor fluids which expand upon freezing. Although occasional freezing ofthe urea may occur under unusual climatic conditions during vehicle soakperiods, the urea tank may be installed proximately to a heat rejectingelement in the vehicle such that it attains a temperature greater than12° C. readily upon reactivation of the vehicle 10. Heat rejectingelements may be an engine, a radiator, an oil pan, an exhaust element,as examples.

[0038] Freezing of urea in the dispensing system may be avoided bycirculating urea through dispensing nozzle 50 via a secondary fluidsupply 86 and a secondary fluid return 88, as shown in FIGS. 2, 3 and 7.If urea reservoir 82 is underground, urea is maintained at a temperatureof about 10-15° C. By circulating flow within dispensing nozzle 50,freezing of the urea is prevented, expect, perhaps, at the very lowestambient temperature conditions. If urea reservoir 82 is above ground, asshown in FIG. 4, a secondary fluid heater 84 may be employed to maintaina desired temperature to prevent freezing of urea. Temperature sensor 74may be relied upon to determine when to require a circulating flowshould be pumped through secondary fluid supply 86 and secondary fluidreturn 88 by secondary fluid pump 76 and when secondary fluid heater 84should be employed. Alternatively, a signal from a secondary fluidoutlet temperature sensor 80 may be used to determine requirements forcirculating flow and heating of the secondary fluid.

[0039] Fluid delivering and receiving means are discussed above inreference to FIGS. 1-5. Possible other means include, but are notlimited to: pumps, electronic actuators, support brackets, springs,valves, reservoirs, tubing, tubing connectors, fittings, pressuresensing devices, fluid level sensing devices, The shutoff apparatus fordispensing the primary fluid has been discussed above. However, asolution should be provided for ceasing flow to secondary tank 22 whenit is full. When secondary tank 22 is full, combination vent valve 24closes causing pressure in secondary tank 22 to equal delivery pressure,thereby causing flow to cease. Secondary tank 22 may be designed towithstand the delivery pressure without rupturing. The dispensing systemmay contain a secondary fluid pressure regulator 78 on the supply sideto maintain a predetermined pressure less than a design pressure ofsecondary tank 22.

[0040] When dispenser nozzle 50 is uncoupled from filler neck 42, checkvalve 32 in secondary fluid filling passageway 26 prevents secondaryfluid from contaminating primary fluid filling passageway 16.Preferably, check valve 32 should be as close to the inlet tip ofsecondary fluid filling passageway 26 to minimize contamination betweenprimary and secondary fluids.

[0041] Alternatively, a level sensor (not shown) on secondary tank 22may communicate to a transponder 70 on vehicle 10, FIG. 4. Transponder70 may send a signal indicating fluid level to a transceiver 72 coupledto secondary fluid reservoir 82 and secondary fluid pump 76. Whensecondary tank 22 is full, a valve (not shown), located upstream ofdispensing nozzle 50, is commanded to cease delivery of the secondaryfluid.

[0042] Mechanical solutions by which the flow of primary fluid isprevented prior to initiating flow of a secondary flow is discussedabove. Other examples can also be used. If vehicle 10 and fueldispensing system 8 are fitted with radio communication, i.e.,transponder 70 and transceiver 72, respectively, anelectrically-actuated valve in primary fluid dispensing passageway 52could prevent primary fluid flow until secondary fluid flow isoccurring. The dispensing status of the secondary fluid could be sensedby flow metering onboard the dispensing system and a level sensor on thesecondary tank. Alternatively, valves in the primary and secondarypassageways in the dispenser could be mechanically coupled.

[0043] An example of a solution to automatic shutoff is discussed inreference to FIG. 4. Additional automatic shutoff means may include:electrically actuated valves, pressure sensing devices, fluid levelsensing devices, piping, connectors, and electronic actuators.

[0044] The volume of secondary fluid tank 22 is sized to ensure thatsecondary fluid is substantially always available. If the volume ofsecondary fluid tank 22 is determined based on the product of the volumeof primary fluid tank 12 and R, where R is the maximum ratio of theconsumption rate of secondary fluid divided by the consumption rateprimary fluid encountered over the vehicle's operating range. If it isfound in development that the volume of secondary fluid tank 22 based onR is larger than necessary for vehicle 10, even when considering engineoperating scenarios consuming the greatest fraction of secondary fluid,the volume of secondary fluid tank 22 may be reduced accordingly.

[0045] The processes undertaken in dispensing are shown in FIG. 13. Theprocess is initiated in block 100. Dispensing nozzle 50 is engaged withinsert 44 of filler neck 42 in block 102 by an operator of the fluiddispensing station. In block 104, it is determined whether dispensingnozzle 50 is of the appropriate diameter to mate with filler neck 42. Ifnot, this indicates that the dispensing nozzle 50 does not contain theappropriate fluid type for vehicle 10. In this case, the operatorlocates an alternate fuel facility in block 106. In the event of apositive result from block 104, control proceeds to block 108 in whichit is determined whether dispensing nozzle 50 is properly indexed withfiller neck 42. A negative result in block 108 is indicated when vacuumshutoff passageway 58 of dispensing nozzle 50 interferes with inhibitorpad 46 of filler neck 42. If improper indexing has occurred (negativeresult in block 108), the operator rotates nozzle 50 with respect tofiller neck 42, in block 110, until engagement is possible and apositive result in block 108 is achieved. A positive result in block 108indicates that dispensing nozzle 50 is engaged with insert 44, it isdetermined in block 112 whether nozzle 50 is engaged far enough to allowdispensing of secondary fluid, i.e., are filling and dispensingpassageways of the secondary fluid passageways coupled. If not, theoperator inserts dispensing nozzle 50 farther into filler neck 42, inblock 100. If a positive result in block 108, primary fluid andsecondary fluid dispensing is permitted in block 112. When the fluidshave been dispensed, a valve on the primary dispensing passageway (notshown) automatically shuts off, as provided by the mechanical structuredescribed above in regards to FIGS. 5a-c. When nozzle 50 is removed fromfiller neck 42 by the operator, valves 32 and 60 in the urea passagewayreturn to their normally closed positions, as made possible according toan aspect of the present invention, as described in regards to FIGS.5a-c.

[0046] The embodiments discussed above refer to dispensing two fluidsthrough a single nozzle. However, the invention discussed herein may beextended to dispense three or more fluids through a single nozzle.

[0047] While several modes for carrying out the invention have beendescribed in detail, those familiar with the art to which this inventionrelates will recognize alternative designs and embodiments forpracticing the invention. Thus, the above-described preferredembodiments are intended to be illustrative of the invention, which maybe modified within the scope of the following claims.

1. A method for fueling a vehicle, the method comprising: delivering afirst stream of fuel and a second, separate, stream of reductant to thevehicle when the vehicle is equipped with a fuel tank capable ofreceiving said first stream of fuel and a reductant tank capable ofreceiving said second stream of reductant; and delivering only saidfirst stream of fuel to the vehicle when the vehicle is not equippedwith said reductant tank.
 2. A system for fueling a vehicle comprising:means for delivering a first stream of fuel and a second, separate,stream of reductant to the vehicle when the vehicle is equipped with afuel tank capable of receiving said first stream of fuel and a reductanttank capable of receiving said second stream of reductant; and,delivering only said first stream of fuel to the vehicle when thevehicle is not equipped with said reductant tank; and an operatortrigger coupled to said delivering means.
 3. A fuel system for a vehiclecomprising: means for receiving a first stream of fuel in a fuel tankand a second, separate, stream of reductant in a reductant tank; andautomatic shutoff means for stopping said receiving of said fuel whensaid fuel tank is filled to a first predetermined level and for stoppingsaid receiving of said reductant when said reductant tank is filled to asecond predetermined level.
 4. A method for a vehicle to be re-fueled,the method comprising: receiving a first stream of fuel in a fuel tankand a second, separate, stream of reductant in a reductant tank; andstopping said receiving of said fuel when said fuel tank is filled to afirst predetermined level; and stopping said receiving of said reductantwhen said reductant tank is filled to a second predetermined level.
 5. Amethod for fueling a vehicle, the method comprising: delivering a firststream of a primary fluid and a second, separate, stream of a secondaryfluid to the vehicle when the vehicle is equipped with a primary fluidtank capable of receiving said first stream and a secondary fluid tankcapable of receiving said second stream; and delivering only said firststream to the vehicle when the vehicle is not equipped with saidsecondary fluid tank.